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Optical communication system, optical transmitter, and transponder

  • US 9,048,953 B2
  • Filed: 11/29/2010
  • Issued: 06/02/2015
  • Est. Priority Date: 11/29/2010
  • Status: Expired due to Fees
First Claim
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1. An optical communication system comprising:

  • an optical transmitter that maps digital data to a plurality of subcarriers which are orthogonal to each other over symbol time so as to be modulated and transmitted as an optical signal via an optical fiber; and

    an optical receiver that performs photoelectric conversion on the optical signal which has propagated through the optical fiber and demodulates each subcarrier signal so as to reproduce original digital data, whereinthe optical transmitter includesa transmission signal processing unit that maps digital data to a plurality of subcarriers orthogonal to each other over symbol time so as to be modulated, and generates a base band OFDM signal from the modulated subcarrier signal; and

    an electric-optic conversion unit that modulates the base band OFDM signal into laser light so as to generate an optical OFDM signal,the transmission signal processing unit and the electric-optic conversion unit transmit optical OFDM signals with alternately different wavelengths for each symbol time, andthe optical receiver includesat least one set of a delay interferometer that delays a portion of the optical OFDM signal received from the optical transmitter via the optical fiber by the symbol time so as to be combined with the optical OFDM signal and a balanced photoelectric conversion unit that converts the combined optical signal into an electric signal; and

    a reception signal processing unit that obtains a subcarrier signal from an output of the photoelectric conversion unit and demodulates data from the subcarrier signal so as to reproduce original digital data.

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